Grade: E7140
Standard: GB / T 3077-1988
Feature
8620 alloy steel
Executive Standard: ASTM A29/A29M-04
8620 Chemical composition:
Carbon C: 0.18 ~ 0.23
Si Si: 0.15 ~ 0.35
Manganese Mn: 0.70 ~ 0.90
Sulfur S: to allow the residual content of ≤ 0.035
Phosphorus P: allow the residual content ≤ 0.035
Chromium Cr: 0.40 ~ 0.60
Ni-Ni: 0.40 ~ 0.70
Copper Cu: to allow the residual content ≤ 0.030
Mo Mo: 0.15 ~ 0.25
8620 Mechanical properties:
Tensile strength σb (MPa): ≥ 980 (100)
Yield strength σs (MPa): ≥ 785 (80)
Elongation δ5 (%): ≥ 9
Reduction of area ψ (%): ≥ 40
Impact energy Akv (J): ≥ 47
Impact toughness αkv (J/cm2): ≥ 59 (6)
Hardness: ≤ 197HB
Sample size: sample blank standard size 15mm 8620 Heat treatment and microstructure: heat treatment specifications: quenching 850 ℃, oil cooling; tempering 200 ℃, air-cooled.
8620 Delivery Status: to heat treatment (normalizing, annealing, or tempering) or heat treatment delivery, delivery status should be indicated in the contract.
